Green space in cities is important, but not always and everywhere for the same reasons. Based on literature review and empirical evidence, we describe transformations in the roles of urban green space (UGS) across time and place using the ecosystem services concept. Urban development and societal change affect the degree of UGS functionality via different trajectories like degradation, revalorization and community action. We explain triggers of different trajectories of change and emerging trade-offs within society. An improved understanding of the shifting roles of UGS can guide urban planning and prioritize designs that fit current and future demand. Research on UGS and ecosystem services should more strongly connect to the development of urban lifestyles in diverse contexts, expose trade-offs between beneficiaries, and explore options for adaptive governance.

城市中的绿色空间很重要，但出于相同的原因，并非总是如此。基于文献综述和经验证据，我们使用生态系统服务概念描述了随时间和地点城市绿地（UGS）角色的转变。城市发展和社会变化通过退化，重新估价和社区行动等不同轨迹影响UGS功能的程度。我们将解释社会内部变化轨迹和新出现的权衡取舍的触发因素。对UGS角色转变的进一步了解可以指导城市规划并确定适合当前和未来需求的设计的优先级。对UGS和生态系统服务的研究应在不同背景下更紧密地与城市生活方式的发展联系起来，揭示受益者之间的权衡取舍，